Hey everyone I need help with doing the working out on these equations:
1) 4a + 5 = 21 + 2a
2) 12 - 3b + 4 = 7
2
3) x3 + 63 = 30
3
The first one:
$\displaystyle 4a + 5 = 21 + 2a $
(-2a from both sides)
$\displaystyle 4a -2a + 5 = 21 +2a - 2a $
$\displaystyle 2a + 5 = 21$
(-5 from both sides)
$\displaystyle 2a = 16$
(divide by 2 on both sides)
$\displaystyle a = \frac{16}{2} = 8$
You try the rest and show us your working if you get stuck.